org.springframework.boot.autoconfigure.web.NonRecursivePropertyPlaceholderHelper Maven / Gradle / Ivy
/*
* Copyright 2012-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.autoconfigure.web;
import java.util.Set;
import org.springframework.util.PropertyPlaceholderHelper;
/**
* {@link PropertyPlaceholderHelper} that doesn't allow recursive resolution.
*
* @author Phillip Webb
*/
class NonRecursivePropertyPlaceholderHelper extends PropertyPlaceholderHelper {
NonRecursivePropertyPlaceholderHelper(String placeholderPrefix,
String placeholderSuffix) {
super(placeholderPrefix, placeholderSuffix);
}
@Override
protected String parseStringValue(String strVal,
PlaceholderResolver placeholderResolver, Set visitedPlaceholders) {
return super.parseStringValue(strVal,
new NonRecursivePlaceholderResolver(placeholderResolver),
visitedPlaceholders);
}
private static class NonRecursivePlaceholderResolver implements PlaceholderResolver {
private final PlaceholderResolver resolver;
NonRecursivePlaceholderResolver(PlaceholderResolver resolver) {
this.resolver = resolver;
}
@Override
public String resolvePlaceholder(String placeholderName) {
if (this.resolver instanceof NonRecursivePlaceholderResolver) {
return null;
}
return this.resolver.resolvePlaceholder(placeholderName);
}
}
}